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Finding the Fourth Proportional to 135,063.56, 186,387 and 74,638.40

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Solution

The fourth proportional to 135,063.56, 186,387 and 74,638.40 is: 103,000.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,063.56 : 186,387 = 74,638.40 : x
  2. Step 2: Convert to fraction form
    135,063.56/186,387 = 74,638.40/x
  3. Step 3: Cross multiply
    135,063.56x = 186,387 × 74,638.40
  4. Step 4: Simplify right side
    135,063.56x = 13,911,627,460.80
  5. Step 5: Solve for x
    x = 13,911,627,460.80/135,063.56
  6. Step 6: Final answer
    x = 103,000.60

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.